Process of making the interior of coke-ovens or other kilns tight.



N0. 705mm. Patented July 29, 1902. R. KUHN. PROCESS OF MAKING THE INTERIOR 0F COKE OVENS OR OTHER KILNS TIGHT.

(Application filed Apr. 15, 1902.)

'(No Model.)

UNITED STATES PATENT Onrlgs.

RUDOLF KUHN, OF BRUOH, GERMANY.

PROCESS OF MAKING THE INTERIOR OF COKE-OVENS OR OTHER KILNS TIGHT.

SPECIFICATION forming part of Letters Patent No. 705,681, dated July 29, 1902.

Application filed April 15,1902. Serial No. 103,066: (No specimens.)

To all whom it may concern:

Be it known that I, RUDOLF KUHN, a citizen of Germany, and a resident of Bruch, Westphalia, Germany, have invented a certain new and useful Improved Process of Making the Interior of Coke-Ovens or other Kilns Tight, of which the following is a specification.

It is a well-known fact that coke-ovens, gas-retorts for illuminating-gas, and similar structures are made of bricks which are porous. This is a disadvantage which becomes particularlyinjurious with ovens composed of two chambers, where the hot gases in one chamber come into contact with and act unfavorably upon the contents in the.

other chamber intended to be heated therein. Now this disadvantage is usually not attributed to the porousness of the bricks, but to the walls of the chambers.

cracks and other kinds of perviousness in the sides of the chamber. It is a proven fact that the pores contained in the fireproofbrick material form as far as twenty-five per cent. of the volume of the bricks and that attempts have been made to overcome this disadvantage with several devices serving similar purposes. For instance, muftles for the distillation of zinc and gas-retorts made of one piece have been coated with varnish,or it was endeavored to prevent the penetration of the hot gases through the sides of one chamber into the other by providing a subpressure or bottom current in the hot room.

My invention refers to a process the object of which is the removal of the porousness of sists in mixing fine metallic dust with fineground ashes or other impalpable material,

preferably incombustible, and then blowing by pressure the mixture into the closed coke ovens or retorts. The dust will remain floating within the chamber for a considerable The process con while and will then settle by degrees into the poresor cracks, if any there be, and fill and close the same.

In the accompanying drawings, Figure 1 1s a cross-section of part of a coke-oven on line 1 1, Fig. 2, with the cover removed; and Fig. 2, a longitudinal section of part of an oven, showing the apparatus in action.

The oven contains a number of chambers Ct, separated from one another by brick walls or partitions I). The chambers may be of any size and have openings 0 and d. In order to fill the pores with the metallic dust and ashes, I close the rear opening by means of a re movable cover 6 and introduce into the front opening a pipe or injector f. This pipe is connected with a blower g or other means for injecting compressed air. With the pipe communicates a pipe h, which serves to feed the metallic dust from a receptatle 11 to the injector. By rotating the blower the air mixed with the dust is forced into chamber a to close the pores of the brick walls in the manner described.

What I claim as new, and desire to protect by Letters Patent, is

A process of making the interior of coke= ovens and other kilns tight which consists in mixing fine ore-dust with fine-ground ashes or other dusty material and then blowing the mixture into the hot chamber, the walls or sides of which are intended to be tightened, the effect being that the dust will keep floating for a while and then settle by degrees in the pores and cracks and thereby make the walls perfectly tight.

Signed by me at Dusseldorf, Germany, this 8th day of February, 1902. l p

RUDOLF KUHN.

Witnesses:

WILLIAM ESSENWEIN, PETER LIEBER. 

